I very occasionally use a flash (SF-24D). The flash manual doesn't cover the M8. Here's the question: Camera set to A; flash set to TTL/GNC. Using a 6-bit coded lens. When 'lens detection' is set to 'on', the camera defaults to 1/24 sec. When 'lens detection' is turned off, it defaults to 1/250. Does anyone know why this should be? Thanks.